JP5714685B2 - Apparatus and method for transmitting paging message for peer-to-peer communication - Google Patents

Description

  Preferred non-limiting embodiments of the present invention generally relate to wireless communication networks. In particular, embodiments of the present invention relate to device-to-device communication.

  The following description of the background art includes insight, discovery, understanding or disclosure, or relevance, along with disclosure provided by the present invention that is not known in the art prior to the present invention. Some of these contributions of the present invention are specifically pointed out below, but other such contributions of the present invention will be apparent from the context.

  Wireless communication systems are constantly being developed. The development system provides cost effective support with high data rates and resource utilization efficiency. One communication system under development is the Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) Release 8. An improved version of the long-term evolution radio access system is referred to as LTE Advanced (LTE-A). LTE is designed to support various services such as high speed data, multimedia unicast and multimedia broadcast services.

  In addition to cellular operation, most systems allow direct device-to-device communication. Current methods for device-to-device communication use low power technologies such as Bluetooth or wireless local area networks (WLANs). In these solutions, the communication is completely independent of the communication infrastructure and is usually based on the users being in view of each other. In networks designed for use by government agencies and emergency services such as Tetra (terrestrial trunk radio), device-to-device communication is implemented, but those solutions are used in common communication networks. Not suitable for.

  Since it has been proposed to reserve a certain frequency band (so-called white space) for non-cellular radio use, it is necessary to realize device-to-device communication having a range longer than the field of view. The development of such a solution faces a number of challenges. For example, the solution should be able to function without interfering with cellular operation and minimize extra device power consumption.

  The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the invention. It is not intended to identify key / critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts of the invention in a simplified form as a prelude to the more detailed description that is presented later.

  According to one aspect of the present invention, a message including information regarding establishment of a device-to-device connection with at least one device is transmitted to a network element and for a paging message between devices establishing device-to-device communication. An apparatus is provided that is configured to receive information regarding a timing reference from a network element.

  According to another aspect of the invention, a message is transmitted by a device to a network element that includes information regarding the establishment of a device-to-device connection with at least one device, and a paging message between the devices establishing device-to-device communication Receiving information about a timing reference for the network element from the network element.

  According to an aspect of the present invention, a message is received from a user device that includes information related to establishing a device-to-device connection with at least one other set of user devices, and the message related to the establishment is received from at least one other user device device. A device is provided that is configured to transmit to a device information related to a timing reference for a paging message between devices that transmit to the set and establish device-to-device communication.

  According to another aspect of the invention, receiving a message from a user device that includes information related to establishing a device-to-device connection with at least one other set of user devices; A method is provided comprising: transmitting to one other set; and transmitting information regarding a timing reference for a paging message between devices establishing device-to-device communication to the device.

  According to another aspect of the invention, for means for sending a message containing information relating to the establishment of a device-to-device connection with at least one device to a network element and for a paging message between the devices establishing the device-to-device communication Means for receiving information on the timing reference from a network element.

  According to another aspect of the invention, means for receiving from a user device a message containing information relating to the establishment of a device-to-device connection with at least one other set of user devices; An apparatus is provided comprising means for transmitting to one other set and means for transmitting information regarding timing references for a paging message between devices establishing device-to-device communication to the device.

  In accordance with another aspect of the present invention, an action directed to establishing a connection, comprising sending a message to a network element that includes information relating to establishing a device-to-device connection with at least one device, and A computer readable memory is provided that implements a program of instructions that can be executed by a processor to perform an action that includes receiving from a network element information regarding a timing reference for a paging message between devices that establish device communication. The

  According to yet another aspect of the invention, an action directed to establishing a connection comprising a message from a user device that includes information regarding establishment of a device-to-device connection with at least one other set of user devices. An action comprising: receiving, sending a message relating to the establishment to at least one other set of user equipment, and sending information relating to a timing reference for a paging message between the devices establishing the device-to-device communication to the device. A computer readable memory is provided that implements a program of instructions that can be executed by a processor to accomplish the above.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

1 is a simple block diagram illustrating one preferred system architecture. FIG. 1 illustrates an apparatus according to an embodiment of the invention. It is a flowchart which shows embodiment of this invention. It is a flowchart which shows embodiment of this invention. It is a flowchart which shows embodiment of this invention. It is a flowchart which shows embodiment of this invention. It is a flowchart which shows embodiment of this invention. 2 shows an example of a frame structure for uplink LTE advanced transmission.

  Reference will now be made in detail to one preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings, in which some, but not all, embodiments of the invention are shown. Indeed, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are disclosed by lawful application requirements. Is provided to satisfy. The specification refers to “one” embodiment, “one” embodiment, or “an” embodiment in a number of positions, although this is not necessarily the case for each such reference. It does not mean that the features or features apply only to a single embodiment. Other embodiments can also be configured by combining one feature of different embodiments.

  Embodiments of the present invention are applicable to any user terminal, server, corresponding component, and / or any communication system or combination of different communication systems where device-to-device communication is supported. The communication system may be a wireless communication system or a communication system that utilizes both fixed and wireless networks. The protocols used, and the specifications of communication systems, servers and user terminals, especially in wireless communications, are rapidly evolving. Such development requires extra changes to the embodiments. Therefore, all words and expressions are to be interpreted broadly and are intended to illustrate the embodiments without limitation.

  An example of a wireless system to which an embodiment of the present invention can be applied will be described with reference to FIG. 1A. In this example, the wireless system is based on LTE network elements. However, the invention described in these examples is not limited to LTE radio systems, but can also be implemented in other radio systems such as UMTS (Universal Mobile Telecommunications System). In one embodiment, the solution shown here can be applied between user devices belonging to different but compatible systems, such as LTE and MUTS.

  The general architecture of the communication system is shown in FIG. 1A. FIG. 1A is a simple system architecture showing only some elements and functional entities, all of which are logical units that can be implemented differently than shown. The connections shown in FIG. 1A are logical connections and the actual physical connections may be different. Those skilled in the art will appreciate that the system also includes other functions and structures. It will also be apparent that the functions, structures, elements and protocols used for group communication are not relevant to the actual invention. Therefore, they will not need to be described in detail here. One preferred radio system of FIG. 1A comprises an operator service core including the following elements: MME (Mobility Management Entity) 108A and SAE GW (SAE Gateway) 104A.

  The base station, also referred to as eNB (enhanced node B) 100A, 102A in the radio system, hosts functions for radio resource management, that is, radio bearer control, radio admission control, connection mobility control, dynamic resource allocation (scheduling). To do. The MME 108A plays a role of distributing the paging message to the eNBs 100A and 102A. The eNB is connected to the SAE GW at the S1_U interface and is connected to the MME at the S1_MME interface. The eNBs are connected to each other via an X2 interface.

  FIG. 1A shows user devices 110A and 114A located in the service area of eNodeB 100A and user devices 116A located in the service area of eNodeB 102A. User equipment refers to portable computing devices. Such computing devices include wireless mobile communication devices that operate with or without a subscriber identity module (SIM), which includes the following types of devices: mobile phones, smart phones, personal digital This includes but is not limited to an assistant (PDA), handset, laptop computer.

  In the state illustrated in FIG. 1A, the user equipment 110A has a connection 112A with the eNodeB 100A. This connection 112A is associated with calls / services where user traffic is “long distance” through SAE GW 104A. For example, the connection from the user device 110A to the external IP network, for example, the Internet 106A is guided through the SAE GW 108. However, in one suitable wireless system, local calls / services are also conceivable.

  FIG. 1A only shows a simple example. In practice, the network includes more base stations and radio network controllers, and more calls are made by the base stations. Two or more operator networks may overlap, and the cell size and type may differ from those shown in FIG. 1, and so on.

  The LTE physical layer includes Orthogonal Frequency Division Multiple Access (OFDMA) and multiple-input multiple-output (MIMO) data transmission. For example, LTE deploys OFDMA for downlink transmission and single carrier frequency division multiple access (SC-FDMA) for uplink transmission. In OFDMA, a transmission frequency band is divided into a plurality of subcarriers orthogonal to each other. Each subcarrier transmits data to a specific UE. Thus, multiple accesses are achieved by assigning a subset of subcarriers to individual UEs. SC-FDMA uses single carrier modulation, orthogonal frequency domain multiplexing, and frequency domain equalization.

  Embodiments of the present invention are not limited to a specific multiple access method.

  In the uplink direction, LTE-A provides a physical uplink shared channel (PUSCH) for transmitting user data. PUSCH resources are allocated by the network and signaled to the user equipment via the control channel.

  It is clear that the communication system also includes other core network elements in addition to the SAE GW 104A and the MME 108A. Direct communication between different eNodeBs via an air interface can be considered as a special eNodeB where the relay node has a wireless backhaul or, for example, an X2 and S1 interface relayed via an air interface by another eNodeB It can also be performed by embodying the concept of a relay node considered as The communication system can also communicate with other networks such as a public switched telephone network.

  However, these embodiments are not limited to the networks described above by way of example, and those skilled in the art will be able to apply this solution to other communication networks provided with the necessary characteristics. For example, connections between different network elements may be realized with Internet Protocol (IP) connections.

  FIG. 1B illustrates an apparatus according to an embodiment of the invention. FIG. 1B shows a user equipment 110A located in the area of the base station or eNodeB 100A. The user device is configured to be connected to the base station 100A. User device 110A includes a controller 120B operatively connected to memory 122B and transceiver 124B. The controller 120B controls the operation of the user device. The memory 122B is configured to store software and data. The transceiver is configured to set up and maintain a wireless connection to base station 100A. The transceiver is operatively connected to a set of antenna ports 126B connected to antenna structure 128B. The antenna structure includes a set of antennas. The number of antennas is, for example, 1 to 4. The number of antennas is not limited to a specific number.

  The user device also includes various other components, such as a user interface, a camera, and a media player. They are not shown for simplicity.

  Base station or eNodeB 100A includes a controller 130B operatively connected to memory 132B and transceiver 134B. The controller 130B controls the operation of the base station. The memory 132B is configured to store software and data. The transceiver 134B is configured to set up and maintain a wireless connection to user equipment that is within the coverage area of the base station. The transceiver 134B is operatively connected to the antenna structure 136B. The antenna structure includes a set of antennas. The number of antennas is, for example, 1 to 4. The number of antennas is not limited to a specific number.

  The base station is operatively connected to another network element 138B of the communication system. The network element 138B is, for example, an MME (Mobility Management Entity), SAE GW (SAE Gateway), Radio Network Controller (RNC), another base station, gateway, or server.

  A base station is connected to two or more network elements. Base station 100A includes an interface 140B configured to set up and maintain a connection with a network element. Network element 138B includes a controller 142B, a memory 144B configured to store software and data, and an interface 146B configured to connect to a base station. In one embodiment, the network element is connected to the base station via another network element.

  In a cellular system, the network uses paging when there is data to be sent to the user equipment. The network sends a paging message to the user equipment so that the user equipment is ready to receive the data packet. When in idle mode, the user equipment is configured to monitor a paging message from the network during a given time and turn off the receiver to save battery power at other times.

  In device-to-device communication, related devices send paging messages to each other when they want to send. When each device attempts to continuously receive and decode incoming signals, battery consumption is slightly higher. By using paging messages, battery consumption can be significantly reduced. When the user equipment receives a paging message from another set of user equipment, it confirms receipt of the message and starts receiving data from the sending user equipment.

  In one embodiment of the invention, when a user device wants to establish a device-to-device connection, it contacts the network connected to it. The network contacts the destination user device and determines an appropriate time for the paging message.

  When a set of user equipments involved in device-to-device communication receives a timing reference from the network, they monitor each other's paging messages during a given time. The received power consumption of devices participating in device-to-device communication is minimized. This is because it is only necessary to listen to another device at a specified moment. Since the network determines the appropriate timing instants, the timing instants can be assigned so that device-to-device paging messages and paging messages sent by the cellular system do not overlap.

  Furthermore, user security can be improved by authentication given through the cellular system.

  In one embodiment, the network also determines a communication carrier, frequency or frequency band suitable for transmitting and receiving paging messages and data. Thus, the use of spectrum allocated for device-to-device communication is guaranteed.

  In one embodiment, the operation of multiple devices (communications of three or more parties) can be coordinated.

  FIG. 2A is a flowchart illustrating an embodiment. In this example, user device 110A desires to initiate device-to-device communication 118A with user device 114A.

  In step 200, the user equipment transmits a message to the eNodeB 100A that includes information regarding establishment of a device-to-device connection with another UE. In one embodiment, the message includes an identifier of the user device that user device 110A wishes to initiate communication with. This identifier is the telephone number, IP address (Internet Protocol address) or e-mail address of the user device, or other data that identifies the user device to the network element.

  The message is transmitted to the eNodeB via the control channel. When user equipment 110A is in idle mode, user equipment 110A may obtain physical uplink shared channel (PUSCH) resources from eNodeB 100A using an LTE RACH (random access channel) procedure. Upon obtaining the resource, the user equipment sends a message to the eNodeB.

  In one embodiment, user device 110A is already in connected mode. Several other applications can be run on the user device, which require a connection to the Internet. For example, an application or widget (such as weather information) requires data updates at a given interval. In such a case, the user device is in an active mode (RRC connection mode) when setting up a device-to-device connection. In the connected mode, the user equipment can send the message directly via the PUSCH because the resource is already available.

  In step 202, the user equipment receives information from the eNodeB regarding timing references for paging messages between the devices establishing device-to-device communication.

  FIG. 2B is another flowchart illustrating one embodiment. In step 204, the eNodeB 100A receives a message from the user device 110A that includes information regarding establishment of a device-to-device connection with at least one other set of user devices, eg, the user device 114A.

  In step 206, the eNodeB sends a message regarding its establishment to at least one other set of user equipment 114A. The eNodeB requests confirmation from the user device 114A that the device-to-device connection is set up. Assuming a positive response, the eNodeB sends information about the timing reference for the paging message between the user equipment in step 208. The message is sent to both UEs.

  FIG. 2C is a flowchart illustrating an embodiment. In step 210, the eNodeB receives a message from the user device 110A that includes information regarding the establishment of a device-to-device connection with at least one other set of user devices (as in step 200 above). In one embodiment, the eNodeB confirms correct reception of the message to the user equipment.

  In step 212, the eNode determines the location of the destination user device with which the user device 110A wishes to communicate. The destination user device is in the service area of the eNodeB, in the service area of another eNodeB, or in another system or network. For example, UE 114A under eNodeB 100A desires direct communication 120A with UE 116A under eNodeB 102A.

  In step 214, the eNodeB determines whether a device-to-device connection can be performed. The eNodeB evaluates the interference state in that area. If the communication frequency of the area is congested or the network determines that the devices are too far apart, device-to-device communication cannot be performed. Here, it is assumed that communication is possible.

  In step 216, the eNodeB sends a message regarding establishment to the destination user device. The eNodeB requests confirmation from the user device that it can set up a device-to-device connection (as in step 206 above).

  In step 218, the eNodeB checks whether the destination user device accepts the connection. If not, in step 220 a message that the procedure is finished is sent to the UE and the process is finished in 222.

  If the procedure continues, a timing reference for the inter-UE paging message is determined at step 224.

  In one embodiment, the determined timing reference is within a predetermined time from the time reserved for the paging message of the system to which the device is connected. This saves power consumption of the user equipment because the device is powered off during periods when paging is not allowed.

  In one embodiment, the network adjusts time when the UE is configured to listen for paging messages from the network. The timing reference also allows both parties to transmit and receive simultaneously using either time division duplex (TDD) or frequency division duplex (FDD) format operations.

  In step 226, information regarding the timing reference is transmitted to the UE. The process ends at 228.

  The step is performed by the eNodeB that receives the message of step 210. At least some of these steps are performed by other network elements of the system. If the destination user device is under another eNodeB, that other eNodeB may be responsible for part of the process. For example, if UE 114A of FIG. 1A establishes connection 120A to UE 116A, both eNodeBs 100A and 102A may be responsible for a portion of the process.

  If the UMTS system is a problem, the radio network controller (RNC) of the UMTS system is responsible for part of the process. One or more network elements of the system's core network (CN) are responsible for part of the authentication process. In LTE, the mobility management entity is responsible for part of the positioning process.

  FIG. 2D is a flowchart illustrating an embodiment. This flowchart illustrates another way of implementing steps 224 and 226 of FIG. 2C. This flowchart is entered from step 218 of FIG. 2C.

  In step 230, a communication carrier, frequency or frequency band for transmitting and receiving paging messages between devices establishing device-to-device communication is determined. In one embodiment, device-to-device communication is performed on a different communication carrier, frequency or frequency band compared to normal network communication. This reduces interference in the network.

  The eNodeB (RNC) has information on what frequency device-to-device communication is allowed in the area. It may also be configured to receive device capability information to ensure that devices that establish device-to-device communication can communicate in the same frequency band. The network element may also exchange such information.

  In step 232, a timing reference for inter-UE paging messages is determined. In one embodiment, different timing references are determined for sending and receiving paging messages between user devices. This applies in particular when time division duplex is used. However, the user equipment may use the same timing reference, and possible collisions between messages are resolved with a suitable recovery mechanism.

  In step 234, information regarding the communication frequency band and timing reference is transmitted to the UE. The process ends at 236.

  FIG. 2E is a flowchart illustrating another embodiment. In this example, the UE is under a different eNodeB or system. One of the UEs is in LTE and the other UE is in UMTS. In another example, the UE is under a different RNC. In another example, the UE is in a different tracking area of the LTE system. The flowchart shows another way of implementing steps 224 and 226 of FIG. 2C.

  In step 238, the eNodeB 100A determines a timing reference for the paging message and a communication carrier, frequency or frequency band for transmitting and receiving the paging message as described above.

  In step 240, timing reference and frequency information is transmitted to another network element 138B. For example, an eNodeB that receives a message from a UE desiring device-to-device communication sends information to an eNodeB serving other participants. In another example, an RNC serving a base station to which a UE is connected transmits information to an RNC serving a base station to which another UE is connected.

  In step 242, eNodeB 100A receives information regarding timing reference and frequency from other network elements 138B. Other network elements adjust the timing reference.

  In step 244, information regarding the communication frequency band and timing reference is transmitted to the UE. If the UE is under a different eNodeB or RNC, the information is sent via another network element. The process ends at 246.

  FIG. 3 shows an example of a frame structure for uplink LTE advanced transmission. Frame 300 includes 20 time slots numbered from 0 to 19. In this example, the network sends a paging message to the user equipment in time slots 0 and 1. The UE requests device-to-device communication, and the network allocates time slots 4 and 5 for the UE to send paging messages, and time slots 18 and 19 for other UEs to send paging messages. Assign to.

  The timing of UE transmission is not fully synchronized because timing advance is not used for device-to-device communication.

  In the example, the UE was given a different timing reference for paging messages. If only one timing reference is assigned for both UEs, it is, for example, timeslots 18 and 19.

  In one embodiment, the UE is simultaneously in RRC connected mode when requesting device-to-device communication. For example, the UE executes an application that requests resources to communicate with a system connected to the UE. In such a case, the timing instant for device-to-device communication is selected so that it does not overlap with the time reserved to receive the scheduled packet from the system connected to the UE.

  Referring to FIG. 1B, the user apparatus 110A includes a controller 120B that controls the operation of the apparatus. The controller 120B sends a message containing information regarding the establishment of a device-to-device connection with at least one device to the network element, and information about a timing reference for a paging message between the devices establishing device-to-device communication The transmitter 124A is configured to receive from a network element. The controller is also configured to store information regarding the timing reference in the memory 122B. Controller 120B is also configured to control transmitter 124A to communicate with other sets of user equipment using resources received from the network. The network element 100A includes a controller 130B that controls the operation of the apparatus. The controller 130B receives a message from the user device that includes information regarding the establishment of a device-to-device connection with at least one other set of user devices, transmits the message regarding the establishment to at least one other user device, The transmitter 134A is then configured to control information related to timing references for paging messages between devices that establish device-to-device communication to the device.

  In one embodiment, the controller 130B is configured to determine whether a device-to-device connection between user devices is feasible after receiving a message requesting a timing reference from the user devices. Controller 130B determines a timing reference and frequency band for sending and receiving paging messages between devices establishing device-to-device communication, and stores information regarding the timing reference and frequency band in memory 132B. Composed. Controller 130B is configured to connect to another device 138B via interface 140B when information is determined.

  In one embodiment, controller 130B is configured to receive at least a portion of information from another network element.

  The other network element 138B determines a timing reference and frequency band for transmitting and receiving paging messages between devices based on information received from the network element 100A, the UE, and other parts of the network. Configured.

  In one embodiment, other network elements are connected to user devices (not shown in FIG. 1B) that are involved in device-to-device communication with user device 110A. In one embodiment, controller 142B of other network element 138B is configured to control interface 146B to receive information regarding timing references for device-to-device paging messages. The controller is configured to adjust the timing reference as needed and to control the interface to send the adjusted timing reference to the network element 100A.

  The steps, signaling messages and related functions shown in the attached drawings are not in absolute time order, some steps can be performed simultaneously or in a different order than given. . Other functions can be performed between or within those steps, and other signaling messages can be sent between the illustrated messages. Also, certain steps can be omitted or replaced with corresponding steps. The signaling message is just one suitable example, and may be composed of a number of separate messages for transmitting the same information. In addition, the message may include other information. A device or controller capable of performing the steps described above may be embodied as an electronic digital computer including a working memory (RAM), a central processing unit (CPU) and a system clock. The CPU includes a set of registers, an arithmetic logic unit, and a controller. The controller is controlled by a sequence of program instructions transferred from the RAM to the CPU. The controller includes a number of microinstructions for basic operations. The implementation of these microinstructions varies based on the CPU design. Program instructions are encoded in a programming language that is a high level programming language such as C, Java, or the like, or a low level programming language such as a machine language or assembler. An electronic digital computer can also have an operating system that provides system services to computer programs written with program instructions. In one embodiment, there is provided a computer program embodied on a distribution medium comprising program instructions configured to control the device to execute the embodiment when loaded into an electronic device.

  The computer program can be in source code form, object code form or some intermediate form and can be stored on a kind of carrier that is an entity or device capable of carrying the program. Such carriers include, for example, recording media, computer memory, read only memory, electrical carrier signals, telecommunications signals, and software distribution packages. Based on the required processing power, the computer program may be executed on a single electronic digital computer or distributed among multiple computers.

  The apparatus may also be implemented as one or more integrated circuits, such as an application specific integrated circuit ASIC. Other hardware embodiments are also feasible, such as circuits made of individual logic components. A mixture of these different implementations is also feasible. When selecting an implementation method, those skilled in the art will consider, for example, the requirements set for the size and power consumption of the device, the required processing capacity, the production cost, and the production volume.

  It will be apparent to those skilled in the art that, as the technology advances, the concepts of the present invention can be embodied in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

100A, 102A: eNodeB (enhanced node B)
104A: SAE GW (SAE Gateway)
106A: Internet 108A: MME (Mobility Management Entity)
110A, 114A: User equipment 112A: Connection 120B: Controller 122B: Memory 124B: Transceiver 128B: Antenna structure 132B: Memory 134B: Transceiver 136B: Antenna structure 138B: Another network element 142B: Controller 144B: Memory 146B: Interface

Claims (31)

Sending a message containing information regarding establishment of device-to-device communication with at least one device to a network element of the communication system;
A timing reference for communicating a paging message with a device in the at least one device establishing the device-to-device communication, from the time reserved for the paging message of the communication system to which it is connected Receiving information from the network element about the timing reference within a certain time;
Transmitting and receiving corresponding paging messages for the device-to-device communication simultaneously using the timing reference;
Device configured as follows.   The apparatus of claim 1, wherein the apparatus is configured to transmit a message that includes an identifier of at least one apparatus.   The apparatus according to claim 1 or 2, wherein the apparatus transmits a message using a control channel of the communication system to which the apparatus is connected.   The apparatus according to any of claims 1 to 3, wherein the apparatus is configured to transmit a message using a physical uplink shared channel.   The apparatus according to claim 1, wherein the apparatus is configured to use a timing reference when transmitting a paging message to at least one apparatus. The device receives information including a different timing reference for sending and receiving paging messages with devices in the at least one device establishing the device-to-device communication, and using the timing reference for the paging message. 6. An apparatus according to any preceding claim, configured to transmit and receive at different timings using the different timing references instead of transmitting and receiving simultaneously . Depending on the device,
Sending a message by the device to a network element of the communication system including information regarding establishment of device-to-device communication with at least one device;
A timing reference for communicating a paging message with a device in the at least one device establishing the device-to-device communication, the time reserved for the paging message of the communication system to which the device is connected Receiving information from the network element by the device about the timing reference within a certain period of time;
Simultaneously transmitting and receiving corresponding paging messages for the device-to-device communication using the timing reference;
With a method.   The method of claim 7, wherein the message includes an identifier of at least one device.   The method according to claim 7 or 8, further comprising transmitting a message using a control channel of the communication system to which the device is connected.   10. A method according to any of claims 7 to 9, further comprising using a timing reference when sending a paging message to at least one device. Receiving information including different timing references for transmitting and receiving paging messages with devices in the at least one device establishing the device-to-device communication, and simultaneously transmitting the paging messages using the timing references and 11. A method according to any of claims 7 to 10, further comprising transmitting and receiving at different timings using the different timing references instead of receiving . Receiving a message from the user equipment of the communication system that includes information relating to the establishment of device-to-device communication with at least one other user equipment;
Sending a message regarding its establishment to said at least one other user equipment;
A timing reference for paging messages between the user equipment to establish the device-to-device communication, the timing reference, the time from the time that is reserved for paging message of the communication system itself is connected Ri inner near, corresponding paging message for the device pair device communication Ru are simultaneously transmitted and received by the user equipment by using the timing reference, you send information related to the timing reference,
Device configured as follows.   The apparatus of claim 12, wherein the apparatus is configured to determine whether device-to-device communication between user devices is feasible.   14. The device according to claim 12 or 13, wherein the device is configured to receive a message including information regarding an identifier of at least one other user device. The device transmits the information including the different timing reference for transmitting and receiving a paging message between the user equipment to establish a device-to-device communications, transmit and receive simultaneously using the timing reference of the paging message Alternatively, an apparatus according to any of claims 12 to 14, configured to transmit and receive at different timings using the different timing references . The device, the composed of at least one other user device to receive confirmation of the device-to-device communication, apparatus according to any one of claims 12 15.   17. A device according to any of claims 12 to 16, wherein the device is configured to communicate with at least one other user device via another network element.   18. Apparatus according to any of claims 12 to 17, wherein the apparatus is configured to exchange information regarding timing references with another network element.   The apparatus according to any of claims 12 to 18, wherein the apparatus is configured to determine a timing reference for sending and receiving paging messages between the user equipment establishing the device-to-device communication.   20. An apparatus according to any of claims 12 to 19, wherein the apparatus is configured to determine a communication frequency for transmitting and receiving paging messages between the user equipment establishing the device-to-device communication. Depending on the device,
Receiving a message from a user device of the communication system that includes information regarding establishment of device-to-device communication with at least one other user device;
Sending a message regarding the establishment to the at least one other user equipment;
A timing reference for paging messages between the user equipment to establish the device-to-device communication, the timing reference is from the time that is reserved for paging message of the communication system in which the device is connected Ri time in the near, corresponding paging message for the device pair device communication Ru are simultaneously transmitted and received by the user equipment by using the timing reference, and transmitting the information on the timing reference,
With a method.   The method of claim 21, further comprising determining whether the device-to-device communication between the user devices is feasible. Instead of transmitting information including different timing references for transmitting and receiving paging messages between the user equipment establishing the device-to-device communication, and simultaneously transmitting and receiving the paging messages using the timing references. 23. The method of claim 21 or 22, further comprising transmitting and receiving at different timings using the different timing references .   24. A method according to any of claims 21 to 23, further comprising determining a timing reference for sending and receiving paging messages between the user equipment establishing the device-to-device communication.   25. A method according to any of claims 21 to 24, further comprising determining a communication frequency for transmitting and receiving paging messages between the user equipment establishing the device-to-device communication. Means for transmitting a message containing information regarding establishment of device-to-device communication with at least one other device to a network element of the communication system;
A timing reference for a paging message with at least one other device that establishes the device-to-device communication, within a certain time from the time reserved for the paging message of the communication system to which it is connected Means for receiving information about the timing reference from the network element;
Means for simultaneously transmitting and receiving corresponding paging messages for the device-to-device communication using the timing reference;
With a device. Means for receiving a message from the user device that includes information regarding establishment of device-to-device communication with at least one other user device;
Means for sending a message regarding its establishment to said at least one other user equipment;
A timing reference for a paging message with said at least one other user equipment establishing said device-to-device communication, wherein said timing reference is reserved for a paging message of said communication system to which it is connected Ri time in the near-in from that time, that are sent and received simultaneously by the user equipment using a corresponding paging message the timing reference for the device pair device communication means for transmitting information on the timing reference ,
With a device.   28. The apparatus of claim 27, comprising means for determining whether device-to-device communication between user devices is feasible.   29. Apparatus according to claim 27 or 28, comprising means for exchanging information about the timing reference with another network element. An action directed to establishing a connection,
Depending on the device,
A timing reference for a paging message with said at least one device that transmits a message containing information regarding the establishment of device-to-device communication with at least one device to a network element of the communication system; and Receiving information about the timing reference from the network element that is within a time period from a time reserved for a paging message of the communication system to which the device is connected;
A computer readable memory that implements a program of instructions that can be executed by a processor to perform actions including simultaneously sending and receiving corresponding paging messages for the device to device communication using the timing reference. An action directed to establishing a connection,
Depending on the device,
Receiving a message from the user device including information regarding establishment of device-to-device communication with at least one other user device;
A timing reference for a paging message with the at least one other user device that establishes a device-to-device communication, and transmits a message regarding the establishment to the at least one other user device, the timing reference , the user Ri time in near that from the time that is reserved for paging message of the communication system in which the device is connected, corresponding paging message for the device pair device communication using the timing reference At the same time that are sent and received, a computer readable memory to carry out instructions of a program that can be executed by a processor to perform actions comprising signal to you route information on the timing reference by the device.

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